Heaven is not a place so don’t ask me where is it. For Heaven is not just a concept, not a realm, not a dimension nor even not the holiest possible place where god and his angels may dwell. For me, Heaven is simply a state of mind. A state between unconsciousness  and being dead, where we believe (as a delusion) we are living with god because we feel total happiness with no worries, with no problems; plain total peace of our mind, of our heart and our soul.